Dialing method for effecting international call in intelligent cellular phone

ABSTRACT

A dialing method for effecting international call in intelligent cellular phone utilizes a conversion table for storing system codes of a plurality of network companies worldwide and their international access codes and a phone book for storing a plurality of telephone numbers having international access codes respectively of different called parties in the database thereof to let the cellular phone be able to determine current location area while calling in international roaming and find the correct international access code from conversion table in accordance with system code received from an approximate network company for replacing international access code in telephone number searched from phone book.

FIELD OF THE INVENTION

[0001] The present invention relates to cellular phones and more particularly to a dialing method for effecting international call in intelligent cellular phone.

BACKGROUND OF THE INVENTION

[0002] Cellular phones have been popular worldwide in recent years due to its portability, multifunction, and inexpensive unit price as a communication device for social or business purpose. Further, as compared to conventional wire telephones cellular phones have advantages in certain fields such as convenience in an outdoor environment and portability. However, the functionalities of cellular phone have not been perfect. For example, a telephone number stored in a phone book of cellular phone is not available if the international access code of a location area making a phone call is different from that preset in phone book by user. In the example of international roaming, a successful cellular phone call is made possible only after a user knows international access code, national code, area code and numbers of a telephone of a called party in advance, i.e., user has to dial international access code, national code, area code and numbers sequentially. In view of above, international call made by cellular phone is not convenient. In another case of making conversations with several people located in different countries, the searching process for corresponding international access code and operation thereof are more complex and time consuming. This really bothers cellular phone user, thus causing inconvenience. Hence, there is a need to solve above problems associated with international calls made by cellular phones. Moreover, it is desirable to provide a novel cellular phone which can perform a dialing method for effecting international call in a convenient effective manner in order to overcome the above drawbacks of prior art.

SUMMARY OF THE INVENTION

[0003] It is therefore an object of the present invention to provide a dialing method for effecting an international call in an intelligent cellular phone comprising the steps of storing system codes of a plurality of network companies worldwide and their international access codes in a conversion table in a database of a memory of the cellular phone and storing a plurality of telephone numbers of different called parties in a phone book in the database; searching for a telephone number stored in the phone book according to name of a called party to be dialed; determining whether system code received from an approximated telephone company in the location area of calling this telephone number is different from the system code while storing this telephone number in phone book; If different, accessing revision table and searching for international access code corresponding to system code of the approximated telephone company, and replacing international access code in the telephone number searched from phone book by the international access code searched from revision table in accordance with system code received from the approximated telephone company; and automatically dialing the telephone number having a correct international access code out. This is a convenient and practical design.

[0004] The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0005]FIG. 1 is a block diagram of electronic elements of an intelligent cellular phone for effecting international call according to the invention; and

[0006]FIG. 2 is a flow chart of a dialing method for effecting such international call.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] The invention is directed to a dialing method for effecting an international call in an intelligent cellular phone. The intelligent cellular phone comprises a conversion table in a database in memory 11 for storing system codes and international access codes provided by many international telephone companies and a telephone book in the database containing a plurality of telephone numbers (including international access codes, national codes, area codes and numbers) with respect to different called parties. As the cellular phone is used by a user, a central processing unit (CPU) 13 thereof determines whether a phone book mode is activated. If not, CPU 13 receives an input telephone number and sends it out directly. If phone book mode is activated, CPU 13 searches for a telephone number of a called party going to be dialed in accordance with its name being selected by user from phone book. Then, CPU 13 determines whether system code received from an approximated telephone company in the location area of calling this phone is different from system code while storing this telephone number in the phone book. If same, CPU 13 shows the telephone number searched from phone book on display 15 of cellular phone and sends it out. If system code received from the approximated telephone company is different from the one while storing this telephone number in the phone book, CPU 13 may access revision table in memory 11 searching for international access codes associated with system code of the approximated telephone company, and replace international access code in the telephone number searched from phone book by international access code searched from revision table in accordance with system code received from the approximated telephone company. Then telephone number having a correct international access code is shown on display 15 of cellular phone. In brief, a cellular phone user may select a desired telephone number to be dialed from phone book. Then the system of the invention can automatically insert a correct international access code into the telephone number searched from phone book corresponding to system code received from the approximated telephone company before dialing it out. This is a convenient and practical design.

[0008]FIG. 1 is a block diagram of electronic elements of an intelligent cellular phone for effecting international call according to the invention. CPU 13 of cellular phone may establish a connection with a base station through transceiver circuit 16 and antenna 17. Hence, CPU 13 may receive telephone signals from the base station. The received signals are converted into sound waves prior to amplifying the same through speaker 18. Also, sound waves from microphone 19 are received by CPU 13. The received sound waves are converted into telephone signals in CPU 13 prior to transmitting to the base station through transceiver circuit 16 and antenna 17. Moreover, CPU 13 may send processed data to display 15 for showing and memory 11 for storing. In addition, CPU 13 may access data stored in memory 11. Additionally, CPU 13 may receive input alphanumeric data from keypad 110 by user.

[0009]FIG. 2 is a flow chart of a dialing process for effecting above international call by CPU 13 of cellular phone when cellular phone enters into a waiting state while calling in an international roaming. In step 1, the process determines whether the cellular phone enters into a phone book activation mode. If not, process receives input telephone number directly prior to going to step 5. If yes, process receives called party's data such as name and searches the associated telephone number from phone book (step 2). In step 3, process searches for system code transmitted by an approximate base station of a network company prior to establishing a connection therewith. Then cellular phone accesses revision table in memory 11 and searches for an international access code corresponding to system code received from the approximate base station prior to determining whether international access code of the location area of dialing this telephone number is the same as the one while storing the telephone number. If yes, process goes to step 4. If not, process replaces international access code in the telephone number to be dialed by international access code searched from the revision table prior to going to step 4. In step 4, process shows telephone number having a correct international access code to be dialed on display 15 of cellular phone. Then in step 5, process determines whether the telephone number is dialed. If not, process returns to step 1.

[0010] In brief, when a cellular phone user has entered into a phone book activation mode and a desired telephone number to be dialed has been selected from phone book, CPU 13 may access revision table in memory 11 and search for a correct international access code corresponding to system code received from a network company in the location area of making this phone call. The telephone number having a correct international access code is automatically dialed out accordingly. This is a convenient and practical design. By utilizing this method, problems associated with prior art such as inconvenient in making conversations with several people located in different countries, complex and time consuming regarding searching process for corresponding international access code and operation thereof, etc. are substantially eliminated.

[0011] Moreover, database of cellular phone is updated regularly. Further, such cellular phone may be implemented as a personal digital assistant (PDA) having a cellular phone functionality.

[0012] While the invention has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims. 

What is claimed is:
 1. A dialing method for effecting an international call in an intelligent cellular comprises a conversion table for storing system codes of a plurality of network companies worldwide and their international access codes and a phone book for storing a plurality of called parties' names and telephone numbers having international access codes respectively in a database thereof in order to let said cellular phone be able to recognize current location area in accordance with system code received from an approximate network company while calling in international roaming by selecting a telephone number from said phone book and find the corresponding international access code from said conversion table for replacing said international access code in said searched telephone number.
 2. The method of claim 1, wherein said cellular phone receives input telephone number and dials it out directly while said cellular phone doesn't enter into a phone book activation mode.
 3. The method of claim 1, wherein said cellular phone shows a telephone number having said correct international access code on display of cellular phone before dialing.
 4. The method of claim 1, wherein said cellular phone is a personal digital assistant (PDA) having a cellular phone functionality. 